Nghiên cứu thực nghiệm sử dụng cốt liệu nhỏ tái chế từ khối xây gạch đỏ cho bê tông tự lèn có hàm lượng tro bay cao=Experimental study on using recycled fine aggregate from red brick wall for self-compacting concrete with with high volume fly ash

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Tác giả: Hùng Cường Nguyễn

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học công nghệ xây dựng (Đại học Xây dựng Hà Nội), 2024

Mô tả vật lý: tr.30-41

Bộ sưu tập: Metadata

ID: 240051

Thêm vào giỏ

Bài báo này tác giả trình bày kết quả nghiên cứu thực nghiệm về việc sử dụng khối xây gạch đỏ làm cốt liệu nhỏ tái chế cho bê tông tự lèn có hàm lượng tro bay cao. Nghiên cứu sử dụng 100% khối xây gạch đỏ tái chế làm cốt liệu nhỏ cho bê tông tự lèn, hàm lượng tro bay áp dụng 50% khối lượng bột. Kết quả nghiên cứu cho thấy so với bê tông tự lèn sử dụng cát tự nhiên, việc sử dụng 100% cốt liệu nhỏ tái chế từ khối xây gạch đỏ có thể chế tạo bê tông tự lèn có tính công tác đáp ứng yêu cầu thi công bằng cách tăng hàm lượng phụ gia siêu dẻo, cường độ nén giảm 16,60%, cường độ uốn giảm 5,82%, độ thấm ion clorua tăng 164,6%, độ mài mòn tăng 22,9%. Tuy nhiên, chi phí vật liệu sản xuất bê tông tự lèn sử dụng cốt liệu nhỏ tái chế từ khối xây gạch đỏ thấp hơn so với bê tông tự lèn sử dụng cát tự nhiên khoảng 6,10%. Đồng thời, so sánh với bê tông truyền thống có cường độ nén tương đương (M250), chi phí vật liệu sản xuất bê tông tự lèn sử dụng cốt liệu nhỏ tái chế từ khối xây gạch đỏ thấp hơn khoảng 10,88%.This paper presents experimental research results on utilizing red brick wall as recycled fine aggregate for selfcompacting concrete with a high volume of fly ash. The study employed 100% recycled red brick wall as fine aggregate for self-compacting concrete, with the fly ash content comprising 50% of the powder volume. The research results show that compared to self-compacting concrete using natural sand, using 100% recycled fine aggregate from red brick wall can produce self-compacting concrete with workability meeting construction requirements by increasing the amount of superplasticizer and utilizing a high volume of fly ash. This results in 16.60% reduction in compressive strength, 5.82% reduction in flexural strength, 164.6% increase in chloride ion permeability, and 22.9% increase in abrasion resistance. Nevertheless, the material cost of producing selfcompacting concrete using recycled fine aggregate from red brick wall is approximately 6.10% lower than using natural sand. Furthermore, compared to traditional concrete with equivalent compressive strength (M250), the material cost of producing self-compacting concrete using recycled fine aggregate from red brick wall is about 10.88% lower.

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